Communication system



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COMMUNICATION SYSTEM l Filed June 15, 1941 14,Sheecs-Shee1;I 14

ATTORNEY.

Patented Apr. 6, 1943 COMMUNICATION SYSTEM Harry J. Nichols, Point Pleasant, N. J., assigner to international Business Machines Corporation, New York, N. Y., a corporation of New Original application August 17, 1940, Serial No. 353,114, now Patent No. 2,288,819, dated July 1941, Serial No. 397,852

8 Claims.

The present invention is a division of applicants copending application Serial No. 353,114, led August 17, 1940, now U. S. Patent No. 2,288,819, issued July 7, 1942, relating to interoce or interstation communication systems and more particularly to communication systems for interconnecting separate typewriters ci a certain standard construction, wherein the operation of any one typewriter, in a normal manner, can be either isolated, at will, from the operation of the system, to permit ordinary individual operation of the typewriters or, on the other hand, operation of one typewriter in the normal manner can be utilized to produce a copy, at a sending station, of the intelligence to be transmitted, and to simultaneously operate a second or receiving similar typewriter or a plurality of such receiving typewriters at remote points. In like manner, each of the plurality of receiving typewriters can be utilized when desired, as sending typewriters, and means are provided for breakin by a receiving station, so that the direction of transmission can be reversed when necessary or desired.

In` devices of the prior art wherein interoiilce messages have been transmitted, special machines, which are not the usual standard equipment of business offices, have been employed. There have also been previousiy provided, electrical interconnecting systems for standard typewriters, but such systems have required either an extensive. modiiication of the mechanical structure of the typewriter itself, to adapt it to such a system, or have required complicated mechanical permutation bar devices for translating a received signal, in order to produce selective actuation or a character key bar in accordance withY the signal received.

Accordingly, one of the objects oi the present invention is to provide novel means for interconnecting and, operating two or more standard oice equipment typewriters, such as the well known Electromatic typewriter, so that such a standard instrument is utilized with very little additional equipment, in aninteroice communication system, to produce speedy and accurate transmission and reception oi messages.

Another object is to provide anovel start-stop system of communication for interconnecting two or more of a certain type oi standard oiiice typewriter, including means for setting up a code signal of electrical impulses representative of a character or function wherein a minimum number of signal channels is utilized for interconnecting machines.

Divided and this application June 13,

Still another object is to provide a system of interoiiice or interstation communication including at least a pair of standard oiiice typewriters having a modified keyboard, a series of solenoids, one for each character key, means controlled by a selected character key for producing a combination of signal code elements representative of the character, means for interconnecting the respective typewriter solenoids including one signal channel only, over which the code signal elements representative of said character are sequentially transmitted, novel start-stop, sendreceive distributor'means for sending-or receiving, respectively, at separate stations, and in synchronism, the code elements comprising a representative signal, and mechanical-electrical translator means for receiving said code elements, translating the same, and selectively choosing that solenoid only, which corresponds to the key depressed at the sending station.

Another object is to provide a novel clutch for operation of the start-stop mechanisms at the sending and receiving stations. v

A further object is toprovide a novel single revolution or non-idling mechanism for thestartstop clutch.

Other objects or" the invention will be poin-ted out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings: I

Fig. 1 is a schematic view illustrating teleprinting devices such as oiiice typewriters suitable for ordinary ofce work and also utilized for producing code signal permutations representative of a character and controllable by remotely originating signals, to type a character, and

means for electrically interconnecting a pair of such devices by a minimum number of signal channels for signal transmission therebetween. Fig. 2 isy a schematic view, in skeleton outline only, illustrating fundamentally how the operation oi a character key produces a code permutation of signal components. representative of the particular character, which components, in turn, are relayed in seriatim, to the line, by a distributor assembly, and also illustrating how a corresponding key bar is electrically operated, by a characteristic signal received from a remote station and translated, to thereby select the corresponding solenoid.

Fig. 3 is a schematic diagram illustrating in outline only, a complete communication system including separate sending and receiving stations, respectively, and the circuits for breakin.

Fig. 4 is a schematic view illustrating the circuits and elements of a sending mechanism with the send-receive relay energized and the startstop clutch in the normal stop position.

Fig. 5 is a schematic view of a portion of Fig.

4, but with the send-receive relay deenergized and the start-stop clutch in the preliminary stop position.

Fig. 6 is a schematic View of a portion of Fig. 4, with the latch control circuit added but with the send-receive relay deenergized and with the start-stop clutch in the preliminary stop position.

Fig. 'l is a schematic view illustrating the circuits and mechanism used in receiving and including the mechanical-electrical translator, the mechanical operating elements of the respective translator cascade switches being indicated schematically only.

Fig. 8 is a plan view illustrating in detail the construction and mounting of the permutation unit rockshafts and the particular mounting of the universal bail rockshaft and its torque bias spring. Y

Fig. 9 is a detail View of one of the code rockshafts. Fig. 10 is a fragmentary sectional view illustrating in detail the assembly of the clips for operating the rockshafts by means of a slidable selector member and studs mounted thereon.

Fig. 11 is a fragmentary sectional view of the device of Fig. 10.

Fig. 12 is a fragmentary sectional view illustrating in detail the operation of the switch operating push pins by the cam grooves in a rockshaft and with the contact elements of the switch out of engagement.

Fig. 13 is a View similar to Fig. 12 with the contact elements of the switch in engagement.

Fig. 14 is a fragmentary sectional View illustratingin detail the operation of the rockshaft detent pin for holding the rockshaft in its operated or oscillated position,

Fig. l5 is a plan view, with parts broken away and partly in section, of a distributor combined with, one form of novel signal storage mechanism and Athe means operating the same.

Fig. 16 is a sectional View taken on the line lli-I6 of Fig. 15 illustrating a transmitting camV and push pins and groups of contacts operated thereby.

Fig. 17 is a side view of the device of Fig. 15 with parts removed illustrating the arrangement of the cascade switch tongues controlled by the signal storage tumblers.

Fig. 18 is a sectional view taken on line I8-I8 of Fig. 17 illustrating the mounting of the respective tumblers, the operating cams therefor, and the cascade switch tongues controlled by a tumbler.

Fig. 19 is a schematic view illustrating in detail therelative circumferential arrangement of the respective transmitting and control cams andcontact operating push pins.

Fig. 20 is a schematic view illustrating in detail therelative circumferential positions of the respective receive cams for operating the translator tumblers.

` Fig. 21 is a diagrammatic illustration of a set of specific line conditions affecting the device of Fig..22.

Fig. 22 is a schematic diagram illustrating the storage tumblers of the novel form of storage mechanism, as illustrated in Figs. 15 and 18 and their respective positions in accordance with the line conditions as diagrammatically illustrated in Fig. 21.

Fig. 23 is a side View of another form of selector or storage mechanism for operating the respective cascade switch tongues.

Fig. 24 is an end View, partly in section, of the device of Fig. 23.

Fig. 25 is a side elevation in section of one i'orm of novel start-stop single revolution clutch mechanism.

Fig, 26 is a sectional view cf the device of Fig. 25, taken on line 26-26.

Fig. 27 is an exploded perspective view illustrating the elements comprising a novel startstop clutch mechanism, which is based upon the principle of the clutch of Fig. 25.

Fig. 28 is an end view partly in section illustrating the start-stop. mechanism and rebound cam of Fig. 27.

Fig. 29 is a side view, partly in section, illustrating the assembly of the start-stop clutch mechanism of Fig. 27.

Fig. 30 is a side view illustrating a part only, of the clutch of Fig. 29 and schematically illustrating a novel start-stop mechanism to be employed with the clutch of Fig. 29, said mechanism being in its stop position.

Fig. 31 is an end view of the device of Fig. 30.

Fig. 32 is a side view similar to Fig. 30, illustrating the novel start-stop mechanism in a released position.

Fig. 33 is an end view of the device of Fig. 32.

Fig. 34 is a side view similar to Fig. 30, illustrating the novel start-stop mechanism with the stop pawl released and in position to stop the clutch.

Fig. 35 is a sectional View of the device in Fig. 30, taken on line 35-35.

Fig. 36 is a perspective View of the shift and carriage release operating and signaling mechanism.

Referring to the drawings wherein like reference characters refer to like parts throughout the several views and more particularly to Fig. 1, the invention is illustrated in the present example as applied to a pair of standard Electromatic typewriters A and B at the sending station A and the receiving station B, respectively, but it is to be expressedly understood that any type of standard ofce typewriter can be utilized in the novel combination of the present invention and that any number of typewriters can be so interconnected.

Typewriter A comprises an Electromatic"` typewriter provided with a standard keyboard wherein the type-bars are power actuated, in a well known manner, upon depression of a chosenk receve and line relays, respectively, are trans-v mitted sequentially over the line tothe typewriter B at the receive station.` 'li-'heV respective` com.` ponente, when received at station B-, arci utilized tor produce sequential conditioning or a shuttle magnet (Figs. '7 and 17) controlling a nevel translator mechanism, aslwill be explained in detail later, whereby the tumblers of the translater are operated to adjustv the cascade switch tongues of the translator to-thereby choose, one certain key solenoid, similar to KS (Figs. 2l and 7') at the station receiving the signal, which key solenoid corresponds to the character key'v depressed at the send station. Energization of' the corresponding solenoid'will, through itsV connecting spring CS, depress the corresponding character keyv (Fig. 2) at the receive station B, so that the sameV character is typed on the record sheet i! (Fig. l) at both the send andl receive stations. Similarly, any of the letters can'be typed and` any function can be performed; so that4 any message can be typed at station A and signals set up at: station A, which when transmitted to station B, will type the same message on the machine at that station.

When the operator at station A wishes to sendV a message to station B, to be simultaneously typed upon both machines, the operator at sta-- tion A, depresses the blank key SRKI, thereby conditioning the machine at station A for sending, station B being normally in-receive condition', all as will be described in detail later. Warning and other signaling means maybe provided' between stations, in a manner well known in the` art7 but such warning and signaling means do, not constitute any part of the present invention.

Referring specically to Fig. 2, there isillustrated in skeleton outlineV only, the mechanism` and circuits for the operation of a chosen character key at station A with the consequent mechanicalV typing of the selected characterl at station A and the setting up of means forproducinga signal representative of the character, whereby such a signal -is transmitted to stationv B to produce typing of the same characterat said station. The operation oithe send conditioned machine to produce al signal for remoteoperation of a receive conditioned machine isv as stop lever 5i? from theV right hand'one of a pair of detente 6! on cam 62. An impeller arm 63, in contact with an impeller lug 64 on cam 62 is constantly urged in, a clockwise direction by means of a spring l and uponthe disengage-` ment oi a channel shaped lug` E@ ofthestopilever from a detent 6l of the cam,.the impeller arm 63, by means of its contact with impeller lug 64, rotates the cam E2, slightly in a clockwise-.direction, until it engages the constantly rotating, power roller E5 which is rotated aboutthe stationary shaft 5l by means of thetypewriter motor f not shown), in a manner well known in the art. The cam 62 by means of its engagement with power roller SS is thereupon rotated a full half revolution clockwise, until the other detent 5l, of the pair of detente on cam B2, engages. the channel shaped lug 6l! of stop lever 58, in a, well known manner. Cam 6271s pivotally mounted by;`

its axis 63 upon an arm G9 cia bell crank 1l): 75.

. tively, of the slider member.

spective slider member.

which in turn is ymounted-for oscillation abouta pivot 11, and upon; such rotation of cam-,62, its eccentric contour causes al lateral, movementof the camY axis iid-to therebyl oscilla-te bellcrank 'itin a counterclockwise direction. SuchV oscillationY causes a downward movement ofthe arm @9a of bell crank 'lil to pullr down a link 12, to rotate bell crank 'i3 against the force of springl ic to actuate link 'l5 to oscillate bell crank 16 to in turn actuate the typebar 'l1 to strike one of thetype characters 'i8 against the record 50; (Fig. i) in a manner well known in the art.

Also upon the rotation of cam 62 and consequent lateral movement of the cam axis, a roller- '59 carried by the lower end of arm 69, is moved laterally to the right, as viewed in Fig. 2. Roller lil is in engagement with a shoulder 80s` on a permutation slider mounted on suitable slottedv guidev bars 23| secured to-the frame (not shown) of the typewriter unit. Each slider is provided with spaced studs 82 extending outwardly and alternately from one side and the otherof the slider and such studs arecarried on both the top and bottom horizontal bars Set and iib, respec- Rotatably mounted on each of a plurality of code rockshafts 83, and'A alternately onopposite sides of the sliders, are the diagrammatically represented rockshaft actuatingr clips Sii. These clips 34 are removably attached to the rockshafts, as described in detail later, the relative number and disposition of the clips. in the assembly for each slider being dependent upon the particular code vaiueoi the` character whose character key controls the re- Therefore, upon depression of any chosen character key, the respective code rockshafts 33, tcwhichthe clipsv are attached., will be rotated, as described presently, and in suoli a direction that the particular` code. permutation representing the character,

will be set up by the respective permutation It is to be particularly noted, that thel switches. universalbail rockshaft SSUBis always actuated by means of a clipili. to permit its controlled, contacts to move momentarily' out oi engagement to therebyproduce a` spacing condition on the signalchannel, this rockshait HUB-*being diagrammaticaliy illustrated as springl biased by means of. a coil spring 55-,5 acting through its associated;

I clip 34. so that the rock-shaft and slider 8d are re turned to their original positions upon completionk ot the half revolution of cam 62;

Upon the abovedescribed lateral movement of the cam axis, the roller 'iiiv moves the slider Bit' to the .right againstv the spr-ing bias effect of spring 854- acting through clip M; and its cooperating stud, whereby the studs carried by the slider actuaten the associated clipsfandrotate the uniyersal bail rockshafft` SSUB and such code rockshafts 83,: asisY required to set up the partisular signal; Such actuation of the clips rotates the associated rockshafts to actuate the diagrammatieally represented, switch operating elements S-5UBy and 86 to permit the associated switch arm or tongue 'iUX oi the universal bail rockshaft to move out of engagement with its associated switch arm SPJUXdand to move the associated switch arms or tongues il? of the code rockshaits seiectiveiy. into engagement with the associated switch arms Sla, dependent upon the ting for the previously typed character. If the same letter is typed twice in succession, the corresponding slider is twice actuated, but only the universal bail rockshaft is rotated since the remaining rockshafts remain in their previously set position, as described in detail later. Thus, such permutation switch elements 81a and 81 as are moved into engagement, close a circuit from the positive side of a D. C. source Bl, as illustrated diagrammatically in Fig. 2 and the universal bail likewise opens a circuit to the positive side of the same source by separation of its pair of contacts STUX and S'IUXa, in series, with a pair of relay controlled contacts S8 and 88a, between the positive side of said source and the distributor assembly.

The particular permutation of switches closed will thereby supply positive potential to the distributor assembly, including the novel start-stop single revolution clutch mechanism, send-receive relay and line relay, diagrammatically illustrated only, in Fig. 2, which, in turn, at the proper time and in proper sequence will transmit the code signals through the signal channel represented by the line, to the distributor assembly at the receive station, in a manner to be described in detail later. Upon completion of a full half revolution of the cam 62, the universal bail rockshaft ESUB is returned to its normal position by spring 85, thereby producing closure of contacts 81UX and B'IUXa but the code rockshafts 83 are retained in their actuated positions by coacting detent pins, as described later, until depression of another character key bar. It is seen, therefore, that in a simple and direct manner, a

standard oilice typewriter, such as the Electromatic typewriter can be utilized, to locally type a character and to set up a code signal having a desired permutation of components, characteristic of the selected character, which signal may be transmitted over the signal channel represented by the line, by the novel means now to be described and which may be utilized at a remote typewriter to type the same character.

The novel communication system comprising the present invention consists of novel permutation means at each station for composing or setting up a series of code signals representative of the characters to be remotely typed, a novel distributor assembly, comprising in addition to a send-receive relay and a. line relay, novel distributor mechanism and a start-stop single revolution clutch mechanism, controlled by the line relay, to in turn control the operation of the distributor mechanism at the same station. The code signal set up by the permutation unit is sequentially transmitted, by the sending distributor to maintain synchronism between the distributor mechanisms at the local station and at the remote stations and to produce typing of the desired character or performance of the desired function, the remote distributor mechanism controlling novel translator means utilizing the signal elements received to thereby operate that solenoid only, corresponding to the character key depressed at the sending station.

A general description coordinated b-y reference to the respective gures of the drawings, will first be given, of the essential elements of a. complete communication system and then a detailed description of the sending or transmitting mechanism and circuits and of the receiving mechanism and circuits including a detailed description of the respective component elements of these mechanisms and circuits will be given, which will be followed by a detailed description of the operation of the system including transmission, reception, break-in and other communication functions.

General description A plurality of typewriters, such as the machine at station A and the machine at station B (Fig. 1) with their respective associated electrical elements, distributor assembly including start-stop mechanism and various control elements are interconnected to comprise the novel teleprinting communication system. The system operates on the start-stop, Baudot S-unit code principle, and by means of associated circuits and mechanisms, two-way transmission of messages over a single channel is provided.

Novel permutation mechanism, as shown in detail in Figs. 8 to 14, inclusive, controlled in the manner as diagrammatically illustrated in Fig. 2, is utilized to open the line circuit to produce the start signal, to set up a code signal of separate signal components, characteristic of the character represented by the chosen depressed key and to produce a stop signal. The particular permutation switch elements which are placed in a closed circuit relation by the permutation mechanism close a circuit up to Contacts, as shown in Fig. 4, which contacts are sequentially controlled, by the transmitting distributor cams which are mounted on the start-stop shaft. along with the receive cams and control cams.

Upon depression of a chosen character key bar to thereby locally type the character and simultaneously set up the code signal representative of that character, the universal bail contacts are operated to open the line circuit and thereby release the novel clutch and start-stop mechanisms of Figs. 25 and 2S or of Figs. 2'7-35, inclusive, whereby the start-stop shaft is rotated one complete revolution, only, and the code signal set up by the permutation unit is sequentially transmitted to the line by means of the distributor cams and the send-receive relay, as diagrammatically illustrated in Fig. 4. The line signals received at the distributor assembly of typewriter B (Fig. l)

control a shuttle magnet (Figs. 7 and 17) to position .selectively the tumblers of the novel selector mechanism of Figs. 15, 17, 1S and 22 or of the novel selector mechanism of Figs. 23 and 24, which tumblers selectively set the cascade switch elements of the translator, as illustrated in Fig. '7, so that the particular key solenoid KS only, which corresponds to the chosen character, is energized, thereby (Fig. 2) pulling d-own the key bar of the chosen character key at station BI (Fig. l.) and producing remote typing of the chosen character.

Transmitting mechanism The transmitting mechanism comprises a novel permutation unit controlled by the key bars of the transmitting typewriter, which permutation unit controls circuits leading to contacts controlled by transmitting cams of the distributor mechanism. The circuits closed by the transmitting distributor cams transmit code elements of the signal to a send-receive relay at the send ststion which relay controls the transmission of the signal elements through a line relay at the sending station and to a line relay at the receiving station. The line relay at the sending station, controls the operation of a novel start-stop single revolution clutch mechanism which, in turn, con.- trols the operation of the distributor mechanism. The construction of the permutation unit, the

`transmitting distributor unit of the distributor assembly, 'the several start-stopsingle .revolution clutch mechanism modifications and the shift and carriage release mechanisms will now be described in detail.

Referring to Figs. 8 to 14, inclusive, there -is disclosed therein details of the elements comprising the novel permutation unit and the manl ner of assembly thereof. In Fig. 8 is illustrated the manner of mounting the several code rockshafts and the universal bail rockshaft. Each of the code rockshafts 83 comprises a cylindrical element, axially bored -at each end to form openings 83a into which project the pivot screws 89, each mounted in a support plate 89a, thereby rotatably supporting the individual rockshafts. Each rockshaft 83 is provided with a plurality of pairs of slots 83s. As shown in Figs. 10 and 11, a plurality of rockshaft operating clips 8d are detachably mounted on the individual rockshafts by insertion of the legs 85a and Sb of the clips into the respective slots comprising each pair. The rounded end 84e on the leg Sb of each clip locks the clip to the rockshaft after insertion thereof into the slots, Each clip is provided with an offset 85d V(Fig. 11) so that the clips can be mounted to cooperate with either the lugs 82 on one side of the slider or with the lugs on the opposite side of the slider, as is seen in Fig. 11. Further, the clips are mounted on the respective shafts either in upright or in inverted position, as is illustrated in Fig. and as diagrammatically indicated in Fig. 2. The particular arrangement and position of the clips for each slider is determined by the particular code value of the character or function whose key controls the slider. It is to be particularll7 noted, that as certain of the pairs of contacts controlled by the code rockshafts, are closed, others are simultaneously opened, so that only those pairs of contacts corresponding to the code value of the particular character or function, remain closed, as the slider SG (Fig. 2) returns to its original position under the control of the torque bias spring S5. Mounted on both the top and bottom bars Eat and 8th, respectively, of the slider 8U, are thestuds 82 attached alternately to opposite sides of the respective bars, as illustrated in Figs. 10 and 11. The single elongated arm of the clips 8:43 abuts these lugs, in one position of the rockshafts, so that upon lateral movement of the slider St, to the right as viewed in Fig. 10, certain of the code rockshafts are rotated clockwise by the upwardly directed, single elongated arms of the clips, respectively, and the remaining code rockshafts are rotated counterclockwise by the downwardly directed single elongated arms. It is assumed, merely for purposes of clarity in descriptionthat such clockwise rotation produces separation of the control contacts while counterclockwise rotation moves the contacts into engagement.

Each code rockshaft is further provided with an axially extending elongated notch 83h formed in the outer periphery of the rockshaft at one end thereof, and with a shorter axially extending notch 83e, formed in the outer periphery of the rockshaft, at the opposite end thereof, as illustrated in Fig. 9.

The universal bail rockshaft 83UB (Fig. 8) is provided with a portion of reduced diameter 83rd at one end, extending axially of the shaft vand a slot 83s, extending axially of the shaft, is formed in the outer periphery of this reduced portion. A coil bias spring 85 is slipped over the reduced portion before the shaft is mounted on its supporting lpivot screws iBS. One end of the coil spring terminates in a'por-tion 85a, extending radially inwards, which is tted into the axially extending slot 83s, as the coil spring is slid linto position over the reducedrpo'rtion 83rd. 'I'helopposite end ofthe coil spring '85 comprises a radially extending -portion 85D 'which extends la-terally to the right, Vas viewed'in Fig.'8, and under the pivot screw 89 of the'adjacent'code rockshaft.

`By rotating the universal bail `ro'ckshaft before the clips are inserted and then inserting the clips to hold the coil 'spring /inits coiledposition, an adjustable amount of torque can be produced by the universal 'bail'rockshaftand spring assembly so that the rock'shaft contacts are positively closedwith a desired force by the spring bias of the universal 'bail rocks'haft upon 'releaseof the associated slider 8l) by the roller T9 v(Fig.'2).

In Figs. 12, 13 and `14 Aare illustrated ,the assembly and coaction of the code rockshafts, notches, contact actuating push pins, contacts and detent pins. 'A permutation switchactuating element or push'pin 86 (Fig. 12) having an'insulated end 86a is mounted for vertical movement, as viewed in Fig. 12, in openings h v'andmiwa in the support and guideplates '9| and92, -respe'c'tively, the uninsulated lower end of the push pin fitting into'the axially extending notch 83h in 'a code rocks'haft 83 'or in the universal bail rockshaft, while the insulated end abuts theself, spring biased 'blade contact .81 held in spaced relation from thecooperating blade contact 81a, bywell known insulating support means 93. `In Fig. 12, the push pin is shown as entered'inthe elongated axially extending notch83b so that the lower blade contact 81 is out of engagement'with the `cooperating blade 81a. 'In Fig. 13, the push pin 86 is shown in its actuated position which position is assumed upon counterclockwise rotation of the 'rockshaft whereby Ithe lower end of the push pin is 'forced out of the'notch'83b'and onto the regularouter periphery of the rockshaft whereby "the push pin is thereby moved bodily upwards, carrying the lower contact '81 into engagement with contact 81a.

In Fig. 14, are illustrated `th'e relative positions of the detent pin and the axial slot at the outer end ofthe rockshaft 83. As lis seen in Fig. '9,'the longer axially extending notch, cooperating with the push pin, is spaced 'circumferentially about the periphery of the code rockshaft with respect to theshorter slot on the opposite end of the shaft, which shorter slot cooperates with vthe detent pin. As the rockshaft is rotated counterclockwise, as'viewed in Figs. 12 and '13, the 'notch83blassumes the position of Fig. 13 while the notch'83c assumes the position of `83b in Fig. 12. A detent pin 9d having a 'flanged portion 94a integral therewith is mounted for vertical movement in f the Vopenings 95a 'and 95o in the support `and guide plates 96 and '91, respectively. A coil spring 98 'abuts the support plate 96 at'one en d thereof and exerts a downward force upon Vthe flanged portion '94a vthereby urging the flange towardsthe guide plate 91 'and holding'the 'lower end of the detent pin in the notch 83e, a'sisfseen in Fig. 14. It is seen, therefore, that upon rotation of a shaft '83, the notch 83h is moved out of engagement with the cooperating push pin 8S and the outer periphery of the rockshaft is moved into engagement with the pushl pin .to thereby move the pin vertically, while the notch 83e is aligned, upon such rotation, with the spring bias detent Y pin 94 -which .pinlSd enters notchfic as shownin Fig. l2 andthe A'roclrshaft 'is therefore positively held in its rotated position until forced back to its initial position by a slider actuated clip.

The operation of the permutation unit is as follows: Upon lateral movement to the right, for example, of the slider 80 as viewed in Fig. 2, the slider and lits studs 82 are moved to the right. Such movement actuates the clips 84 t0 rotate the respective code rockshafts either clockwise or counterclockwise -depending upon the particular assembly of the clips for the actuated slider. Counterclockwise rotation of certain of the code rockshafts, produces closures of the cooperating contacts controlled thereby while clockwise rotation of the other rockshafts permits the cooperating contacts to open. As certain of the rockshafts are rotated counterclockwise to thereby close the associated contacts (Fig. 13) the associated detent pin is aligned with a slot 83e (Fig. 14) and the end of the spring urged detent pin enters the slot to positively hold the rockshaft in its new, contact closing position. As other rockshafts are rotated clockwise, the notches 83a are moved out of alignment with the associated detent pins and the shafts assume the position as shown in Fig. 12 with the contacts 8l and 81a out of engagement. The contact operating pins engaging with their respective notches now serve in the same capacity as did the detent pins in the prior positions of the rockshafts. A certain desired permutation cf the pairs of contacts remains closed after slider 80 moves back to its initial position under the bias of the torque spring 85.

The universal bail rockshaft 83UB is rotated against the torque exerted by coil spring 85, by means of its clip 84 and associated lug 82 upon lateral movement of any slider 8B, to the right, to thereby open its associated contacts B'IUX, lUXa (Fig. 2) and momentarily open the line, as Will be explained in detail later. Upon the return of slider 80 to its initial position, the spring 85 of the universal bail rockshaft rotates the rockshaft back to its initial position to thereby close its associated contacts S'IUX and BTUXa. It is to be noted that no detent pin and cooperating slot is provided for the universal bail rockshaft.

Upon the closure of any pairs of contacts 8l, Sla a circuit is closed (Fig. 4) to the contacts controlled by the cams of the translation distributor unit of the send-receive mechanism, which mechanism will now be described in detail.

Referring to Figs. 15, l5, 17 and 19, the con-` struction, assembly and operation of the distributor of the send-receive mechanism are illustrated therein. A plurality of transmission cams TI to T3, inclusive and control cams TC, TL and TP are mounted on the start-stop shaft 99 in position to be lubricated by oiler wicks OW (Fig. 16) along with the receive cams described later. Control cam TC controls contacts (Fig. 4) which, in turn, control the circuits f the control magnet, control cam TL (Fig. 6) controls the contacts which, in turn, control the circuit to a latch magnet. ITransmission cams T| to T5, inclusive (Fig. 4), control contacts connected in series between the permutation unit contacts and the send-receive relay while cams T4, T and T6 also control holding circuits (Fig. '7) for group magnets of the translator. Transmission cam TP (Fig. 7) controls contacts which, in turn, control the circuit providing energization of the particular key solenoid selected by the translator in response to a received code signal and also controls holding circuits for the group relays.

Referring to Figs, 15 and 17, the horizontal 7 5` Referring to Figs. 3, 15 and 16, it-is seen that' start-stop shaft 99 is transversely journaled in ball bearings |00 forced into suitable recesses bored in the vertical side plates |0| of the distributor mechanism. The start-stop shaft is intermittently driven by means of a novel startstop single revolution clutch mechanism |02 (described later) which is controlled by a start-stop magnet assembly SSM. When the universal bail opens the line circuit, as described above, the

magnet SSM is deenergized to thereby release the stop arm |03 (Fig. 17). This release of the stop arm allows a spring |U3s to rotate the arm |03 counterclockwise, so that a pawl |04 (Fig. 15) attached to the stop arm |63 is moved out of the path of rotation of the stop pin |04B attached to a member of the start-stop clutch and into the path of stop pin IMA intercepting said stop pin to thereby arrest the rotation of the start-stop clutch to halt the start-stop shaft in the preliminary stop position. When the startstop magnet SSM is subsequently energized, the stop arm |03 is moved clockwise (Fig. 17) into the path of rotation of the stop pin HMB to thereby stop the start-stop shaft in the second or normal stop position.

The send o1' transmitting cam sleeve |96 is attached in any well known manner, such as by means of a set screw Illa, to the start-stop shaft 99 for rotation therewith. The cams TC, TL, TI to T6, inclusive, and TP are xed in a chosen sequence on the shaft 99, the separate cams cooperating with their respective push pins to actuate the associated contacts, as described above, and the separate cams being maintained in proper relative axial position by means of spacer rings |01. The cams are clamped against the ange IBSJ at one end of the transmitting cam sleeve by means of the receive cam sleeve |88 urged against the right hand spacer ring |01 cooperating with cam TP by means of the thrust exerted by a nut 99h threaded on the right hand end 99a of the start-stop shaft 99. A key way |09 is machined in the outer periphery of the cam sleeve into which is positioned a cylindrical key ||0 coacting with the inner periphery of the cams to lock the cams and cam sleeve together for simultaneous rotation by means of the start-stop shaft. The contacts controlled by the respective cams are diagrammatically illustrated in Figs. 4 and 7, it being particularly noted that these contacts are controlled by means of the push pins and that the relative positions of the cams, push pins and contacts are as illustrated in Fig. 15. The particular, circumferentially extending, sequence of the cams and their position relative to the respective push pins is illustrated schematically in Fig. 19.

Referring to Figs. 15 and 16, the hardened steel push pins provided with insulated ends la. are aligned with the respective cams by insertion into openings in the front contact mounting plate ||2 and in the back contact mounting plate ||3 fastened by screws Hlla, to the mounting block ||4 attached to the base panel ||5 by screws ||5a. Upon rotation of the start-stop shaft 99, the rounded ends |||b of the steel push pins III, cooperating with the respective cams, sequentially make and break the associated transmission contacts, as will be clear from Fig. 16, to thereby transmit to the line, the elements of a particular code signal, as set by the permutation switches P| to P6, inclusive, each comprising a pair of contacts 81 and Bla. 

